HP 655 Maintenance And Service Manual page 73

d. Top cover (see
e. System board (see
Remove the fan/heat sink assembly:
1. Turn the system board upside down, with the front toward you.
2. Disconnect the fan cable (1) from the system board.
3. Following the 1, 2, 3, 4 sequence stamped into the heat sink, loosen the four captive Philllips
screws (2) that secure the fan/heat sink assembly to the system board.
4. Remove the fan/heat sink assembly (3).
NOTE: Due to the adhesive quality of the thermal material located between the processor heat
sink and processor, it may be necessary to move the processor heat sink from side to side to
detach it.
The thermal material must be thoroughly cleaned from the surfaces of the processor heat sink and
the processor each time the processor heat sink is removed. Replacement thermal material is included
with the processor heat sink and system board spare part kits.
NOTE: The following illustration shows the replacement thermal material locations. Thermal paste is
used on the processor (1) and the heat sink section (2) that services it.
Top cover on page 49)
System board on page 62)
Component replacement procedures
65